CN109638664B

CN109638664B - Switchgear pressure relief device and switchgear

Info

Publication number: CN109638664B
Application number: CN201811556900.9A
Authority: CN
Inventors: 朱向宇; 王焕; 关红伟; 田凤雷; 李军浩; 张二勇; 田红超; 郭忠贺; 郑春阳; 陈波; 李海洋
Original assignee: State Grid Corp of China SGCC; Pinggao Group Co Ltd; Henan Pinggao Electric Co Ltd
Current assignee: State Grid Corp of China SGCC; Pinggao Group Co Ltd; Henan Pinggao Electric Co Ltd
Priority date: 2018-12-19
Filing date: 2018-12-19
Publication date: 2021-10-22
Anticipated expiration: 2038-12-19
Also published as: CN109638664A

Abstract

The invention relates to a switch cabinet pressure relief device and a switch cabinet. The switch cabinet includes a cabinet body and a switch cabinet pressure relief device arranged on the top of the cabinet body. The switch cabinet pressure relief device includes a device frame with a pressure relief channel. The top surface of the device frame is provided with a pressure relief cover, and the pressure relief channel is provided with a device frame. The arc suppression structure includes baffles arranged in layers along the axis of the pressure relief channel, each layer of baffles is arranged at intervals, and two adjacent layers of baffles are arranged staggered along the direction perpendicular to the axis of the pressure relief channel and along the pressure relief channel. The channel axes have overlapping portions. By arranging baffles in layers along the axis of the pressure relief channel in the pressure relief channel, the arc will be sprayed onto the baffle before being sprayed out along the pressure relief channel. The arc is directly extinguished in the pressure relief device, and part of the arc may still be ejected, but the ejection force is greatly weakened, so it is not easy to damage the surrounding items, and it will not easily hurt personal safety, avoiding the rapid flying of the arc. to safety hazards.

Description

Cubical switchboard pressure relief device and cubical switchboard

Technical Field

The invention relates to a switch cabinet pressure relief device and a switch cabinet.

Background

In the operation process of the switch cabinet, a primary circuit short circuit fault can be caused due to various reasons such as insulation aging, human misoperation and the like, high-temperature high-pressure gas is generated instantly under the short circuit current of tens of thousands of amperes, and if the high-temperature high-pressure gas cannot be effectively released in a very short time, the switch cabinet can explode, damage an adjacent switch cabinet and even hurt the personal safety. Therefore, the switch cabinet must be designed with effective pressure relief measures taken into consideration.

The pressure release measure that is used for the cubical switchboard at present has a lot, for example, the high tension switchgear that the grant bulletin number is CN 207134680U's Chinese utility model patent discloses a temperature rise device is pressure relief device promptly, including the device frame, be equipped with the heat dissipation mesh board on the top surface of device frame and the side, it has circular louvre to open on the heat dissipation mesh board, is equipped with the pressure release lid on the heat dissipation mesh board of device frame top surface, and pressure release lid and device frame pass through hinged joint, are provided with the pressure release hole on the pressure release lid, and both sides hem and welding are on the frame about the heat dissipation mesh board of device frame side.

The problems of the prior pressure relief device are that: the arc cannot be effectively protected, and when high-temperature and high-pressure gas rushes out of the pressure relief cover and is sprayed out, the arc is possibly sprayed out through the pressure relief channel, so that surrounding articles are damaged or personal safety is injured.

Disclosure of Invention

The invention aims to provide a switch cabinet pressure relief device, which aims to solve the problems that the existing pressure relief device cannot effectively protect electric arcs, and the electric arcs are easy to damage surrounding articles or hurt personal safety after being sprayed out; meanwhile, the invention also provides a switch cabinet, which solves the problems that the existing switch cabinet pressure relief device cannot effectively protect electric arcs, and after the electric arcs are sprayed out, surrounding objects are easily damaged or personal safety is easily injured, so that potential safety hazards exist in the use process of the switch cabinet.

In order to achieve the purpose, the technical scheme of the pressure relief device of the switch cabinet is as follows:

cubical switchboard pressure relief device is equipped with the pressure release lid including the device frame that has the pressure release passageway on the top surface of device frame, is equipped with arc extinction structure in the pressure release passageway, arc extinction structure includes the baffle along pressure release passageway axis layered arrangement, and each layer baffle interval arrangement, adjacent two-layer baffle along the direction staggered arrangement of perpendicular to pressure release passageway axis and have the overlap section along the pressure release passageway axis.

The invention has the beneficial effects that: through follow pressure release channel axis layering arrangement baffle in pressure release channel, electric arc can spout earlier to the baffle before outwards spouting along pressure release channel, the baffle slows down the outside spun power of electric arc way, each layer baffle interval arrangement, adjacent two-layer baffle is along the direction staggered arrangement of perpendicular to pressure release channel axis and have the overlap portion along the pressure release channel axis then can avoid having the clearance between the baffle that interlocks each other, avoid partial electric arc to spout from the clearance outwards, the blowout power of electric arc is said and is slowed down through the baffle, directly extinguish partial electric arc in pressure relief device, partial electric arc probably still can spout, nevertheless the blowout dynamics is weakened greatly, consequently, be difficult to damage article on every side, also can not injure personal safety easily.

Furthermore, the baffle is provided with heat dissipation holes. Equivalently, the heat dissipation channel is added, so that high-temperature and high-pressure gas can flow outwards from the space between the baffles and can also flow outwards from the heat dissipation holes, and the heat dissipation efficiency is improved.

Further, the heat dissipation hole has a corner portion at an acute angle. The louvre has dimensional change, can effectively block the gas sediment that the arcing in-process produced on the one hand, and on the other hand can increase heat radiating area, reinforcing radiating effect.

Furthermore, the heat dissipation holes are in a pentagram shape. The advantage is that the processing is convenient.

On the basis of any one scheme, the baffle is provided with two layers, a lower folded edge which is bent downwards is arranged on the side surface of the upper baffle close to the pressure relief cover, an upper folded edge which is bent upwards is arranged on the side surface of the lower baffle far away from the pressure relief cover, and the upper folded edge and the lower folded edge are provided with an overlapped part along the axis of the pressure relief channel. The side face of the baffle is provided with the folded edge to guide the advancing direction of the electric arc, the upper folded edge on the side face of the lower baffle guides the electric arc to the direction of the upper baffle, and the lower folded edge on the side face of the upper baffle guides the electric arc to the direction of the lower baffle, so that the electric arc is contacted with the baffle as much as possible, and the arc extinction effect is further improved.

The lower folded edge and the upper folded edge are both inclined folded edges. The inclined folding edges can guide the electric arc to the direction of the baffle plate better, so that the arc extinction effect is further improved.

The switch cabinet pressure relief device further comprises a supporting plate fixed in the device frame, a through hole for the baffle to pass through is formed in the supporting plate, and the baffle is fixed in the through hole. The baffle is equipped with at least two-layerly, if directly carry out fixed connection with baffle and device frame, just need fix respectively every baffle, still need consider baffle length simultaneously, and fixed very inconvenient, and come the supporting baffle through the backup pad then only need fix the backup pad in the device frame, make the baffle pass the backup pad can, a backup pad can support a plurality of baffles simultaneously, it is more convenient to fix.

The side of the device frame is provided with a frame side wall, the frame side wall comprises an outer side plate arranged on the outer layer and an inner side plate arranged on the inner layer, the outer side plate is provided with a long hole for heat dissipation, and the inner side plate is provided with meshes. Set up the inside plate and set up the mesh that is different from slot hole on the outside plate on the inside plate through the inboard at the outside plate, block the activity of electric arc to both sides, avoid partial electric arc to fly out from both sides, guarantee normal pressure release simultaneously.

The pressure relief cover comprises an outer cover plate and an inner cover plate, wherein the outer cover plate is provided with a slot hole for heat dissipation, and the inner cover plate is provided with meshes. Through set up the mesh that is different from outer apron upper slot hole on inlayer apron and inlayer apron in the inboard of outer apron, can further slow down the outside spun power of electric arc way, guarantee normal pressure release simultaneously.

The technical scheme of the switch cabinet is as follows:

the cubical switchboard includes the cabinet body and sets up the cubical switchboard pressure relief device at cabinet body top, and cubical switchboard pressure relief device is equipped with the pressure relief lid including the device frame that has the pressure relief passageway on the top surface of device frame, be equipped with arc extinction structure in the pressure relief passageway, arc extinction structure includes the baffle along pressure relief passageway axis layered arrangement, and each layer baffle interval arrangement, adjacent two-layer baffle along the direction staggered arrangement of perpendicular to pressure relief passageway axis and have the overlap along the pressure relief passageway axis.

The invention has the beneficial effects that: through arranging the baffle along pressure release channel axis layering in the pressure release channel, electric arc can spout earlier to the baffle before outwards spouting along pressure release channel, the baffle slows down the outside spun power of electric arc way, each layer baffle interval arrangement, adjacent two-layer baffle is along the direction staggered arrangement of perpendicular to pressure release channel axis and have the overlap portion along the pressure release channel axis then can avoid having the clearance between the baffle of crisscross each other, avoid partial electric arc outwards spout from the clearance, the blowout power of electric arc is slowed down through the baffle, directly extinguish partial electric arc in pressure relief device, partial electric arc probably still can spout, nevertheless the blowout dynamics is weakened greatly, consequently, be difficult to damage surrounding article, also can not hinder the personal safety easily, avoided bringing the potential safety hazard because of electric arc departure rapidly.

The switch cabinet pressure relief device further comprises a supporting plate fixed in the device frame, a through hole for the baffle to pass through is formed in the supporting plate, and the baffle is fixed in the through hole. The baffle is equipped with at least two-layerly, if directly carry out fixed connection with baffle and device frame, just need fix respectively every baffle, still need consider baffle length simultaneously, it is fixed very inconvenient, and when coming fixed stop through the backup pad, as long as pass the backup pad with the baffle and with the backup pad relatively fixed, with the backup pad fix in the device frame can, a backup pad can a plurality of baffles of fixed stay simultaneously, backup pad quantity also can be according to baffle length setting, it is fixed very convenient.

Drawings

FIG. 1 is a schematic diagram of a switchgear cabinet according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the overall structure of the pressure relief device of the switch cabinet of FIG. 1;

FIG. 3 is a schematic diagram of an internal structure of the pressure relief device of the switch cabinet of FIG. 1;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is a schematic view of the structure of the frame of the apparatus of FIG. 3;

FIG. 6 is a schematic structural view of the support plate of FIG. 3;

FIG. 7 is a schematic structural view of the baffle of FIG. 3;

FIG. 8 is a schematic view of the structure of the pressure relief cap of FIG. 2;

in the figure: 1-a cabinet body; 2-switch cabinet pressure relief device; 21-a device frame; 22-a pressure relief cover; 221-outer cover plate; 222-inner cover plate; 23-a hinge; 24-a baffle; 241-heat dissipation holes; 242-folding the upper edge; 243-lower hem; 25-a support plate; 251-punching; 26-an outer panel; 27-inner decking; 28-long hole.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

The specific embodiment of the switch cabinet disclosed by the invention is shown in fig. 1-2 and comprises a cabinet body 1, wherein a plurality of compartments such as an instrument room, a bus room, a breaker room and a cable room are arranged in the cabinet body 1, and a plurality of switch cabinet pressure relief devices 2 are arranged at the top of the cabinet body 1 corresponding to the compartments. Cubical switchboard pressure relief device 2 includes device frame 21, is equipped with pressure relief lid 22 on the top surface of device frame 21, has the pressure relief passageway in the device frame 21, is equipped with arc extinguishing structure in the pressure relief passageway. As shown in fig. 3 and 4, the arc extinction structure comprises baffles 24 which are arranged in layers along the axis of the pressure relief channel, the baffles 24 in each layer are arranged at intervals, and the baffles 24 in two adjacent layers are staggered in the direction perpendicular to the axis of the pressure relief channel and have overlapping parts along the axis of the pressure relief channel. Baffle quantity sets up according to actual need, for example bus-bar room width is great, and the baffle quantity that corresponds cubical switchboard pressure relief device is just more, and the width of circuit breaker room, cable chamber is less, and the baffle quantity that corresponds cubical switchboard pressure relief device is also less just.

In order to ensure that the baffle 24 does not have an excessive influence on the heat dissipation efficiency, as shown in fig. 7, the heat dissipation holes 241 are formed in the baffle 24, which is equivalent to increasing heat dissipation channels, so that high-temperature and high-pressure gas can flow outwards from the baffle 24 and also from the heat dissipation holes 241, and the heat dissipation efficiency is improved. The preferred adoption of louvre 241 has the structure that is the bight of acute angle, can effectively block the gas sediment that the arcing in-process produced on the one hand, and on the other hand can increase heat radiating area, reinforcing radiating effect. In this embodiment, the heat dissipation holes 241 are in the shape of a five-pointed star, which is advantageous for facilitating the processing.

In this embodiment, the baffle 24 has two layers, the side of the upper baffle 24 close to the pressure relief cover 22 is provided with a lower folded edge 243 which is bent downwards, the side of the lower baffle 24 far away from the pressure relief cover 22 is provided with an upper folded edge 242 which is bent upwards, and the upper folded edge 242 and the lower folded edge 243 have an overlapping part along the axis of the pressure relief channel. The traveling direction of the arc is guided by providing the bent edges on the side surfaces of the baffles 24, the upper bent edges 242 on the side surfaces of the lower baffles 24 guide the arc in the direction of the upper baffles 24, and the lower bent edges 243 on the side surfaces of the upper baffles 24 guide the arc in the direction of the lower baffles 24, so that the arc is in contact with the baffles 24 as much as possible, and the arc extinguishing effect is further improved. In order to guide the arc in the direction of the baffle 24 more favorably and further improve the arc extinguishing effect, both the lower flange 243 and the upper flange 242 are formed as oblique flanges.

Considering that the baffles 24 are more numerous and have longer lengths, and the fixing is troublesome one by one, a support plate 25 is provided in the apparatus frame 21, as shown in fig. 6, a through hole 251 through which the baffle 24 passes is provided in the support plate 25, and the baffle 24 is fixed in the through hole 251. Just so can come fixed stop plate 24 through backup pad 25, pass backup pad 25 with stop plate 24 and with backup pad 25 relatively fixed, with backup pad 25 fix in device frame 21 can, a backup pad 25 can a plurality of stop plates 24 of fixed support simultaneously, backup pad 25 quantity also can be according to 24 length settings of stop plate, it is very convenient to fix. The baffle plate 24 and the support plate 25 are welded together and then integrally welded inside the apparatus frame 21. The side of the baffle 24 close to the pressure relief cover 22 is provided with a notch to facilitate positioning and welding of the baffle 24 to the apparatus frame 21.

As shown in fig. 5, the frame 21 has frame side walls on opposite sides, the frame side walls include an outer plate disposed on the outer layer and an inner plate 27 disposed on the inner layer, the outer plate 26 has long holes 28 for heat dissipation, and the inner plate 27 has meshes. The inner side plate 27 is welded to the inside of the device frame 21. Through set up inboard board 27 and set up the mesh that is different from slot hole 28 on the outer panel 26 on inboard board 27 at the inboard of outer panel 26, block the activity of electric arc to both sides, avoid partial electric arc to fly out from both sides, guarantee normal pressure release simultaneously.

The structural design of the pressure relief cover 22 is similar to that of the side wall of the frame, as shown in fig. 8, the pressure relief cover 22 includes an outer cover plate 221 and an inner cover plate 222, the inner cover plate 222 is welded on the inner side surface of the outer cover plate 221, the outer cover plate 221 is provided with a long hole 28 for heat dissipation, and the inner cover plate 222 is provided with meshes. Through set up inlayer apron 222 and be equipped with the mesh that is different from trompil 28 on the outer apron 221 on inlayer apron 222 at the inboard of outer apron 221, can further slow down the outside spun power of electric arc, guarantee normal pressure release simultaneously. The pressure relief cover 22 is hingedly connected to the apparatus frame 21 by a hinge 23.

During practical application, as shown in fig. 1, when an arcing fault occurs in a compartment in the switch cabinet, an arc moves upwards quickly, and due to the fact that an arc extinguishing structure is arranged in the pressure relief channel, the baffle plate 24 directly extinguishes part of the arc in the switch cabinet pressure relief device 2, part of the arc may still be sprayed outwards, but the spraying force is greatly reduced, destructive influence is not caused easily, and meanwhile, high-temperature and high-pressure gas flushes the pressure relief cover 22 to realize quick pressure relief.

According to the switch cabinet, the baffles are arranged in the pressure relief channel in a layered mode along the axis of the pressure relief channel, electric arcs can be sprayed onto the baffles before being sprayed out along the pressure relief channel, the baffles slow down the force of the electric arcs sprayed out, the baffles of each layer are arranged at intervals, the two adjacent layers of baffles are arranged in a staggered mode along the direction perpendicular to the axis of the pressure relief channel, overlapping parts are arranged along the axis of the pressure relief channel, gaps can be avoided among the staggered baffles, partial electric arcs are prevented from being sprayed out from the gaps, the spraying force of the electric arcs is slowed down through the baffles, partial electric arcs are directly extinguished in the pressure relief device of the switch cabinet, the partial electric arcs can still be sprayed out, the spraying force is greatly weakened, surrounding objects are not damaged easily, personal safety cannot be hurt easily, and potential safety hazards caused by the rapid flying-out of the electric arcs are avoided.

The number of the baffles is set according to the requirement, for example, in the above embodiment, the baffles are provided with two layers, and in other embodiments, the baffles can also be provided with more than three layers. The shape of the opening in the baffle, that is, the heat radiation hole is not limited to the pentagram shape, and may be a circle, a rhombus, a hexagon, or the like, and preferably has a corner shape. Of course, the baffle may not have heat dissipation holes, which has a disadvantage that the heat dissipation efficiency may be affected to some extent.

In the above embodiment, the upper baffle close to the pressure relief cover and the lower baffle far from the pressure relief cover are provided with the folded edges on the side surfaces thereof, and the advancing direction of the arc is guided by the folded edges, so as to further improve the arc extinction effect. The preferred configuration is to have the oblique side inclined. Then, in other embodiments, the hem may also be a vertical hem. The baffle can also be an arc-shaped plate, the upper baffle close to the pressure relief cover is arranged to be an arc-shaped plate back to the pressure relief cover, and the lower baffle far away from the pressure relief cover is arranged to be an arc-shaped plate with an opening facing the pressure relief cover. The baffle can also be made into a flat plate shape, and the two sides are not provided with folded edge structures.

In the above embodiment, one side of the pressure relief cover is hinged to the apparatus frame by a hinge, and the other side is fixedly connected to the apparatus frame. In other embodiments, the pressure relief cover may be fixedly attached to the device frame by plastic screws without the need for hinges. Of course, if the opening on the side wall of the frame is enough to meet the pressure relief requirement, the pressure relief cover can be directly fixed on the device frame, and whether the high-temperature and high-pressure gas can effectively open the pressure relief cover when a fault occurs is not considered.

In the above-mentioned embodiment, the device frame sets up with the cubical switchboard cabinet body is the components of a whole that can function independently, and the device frame is fixed in the cabinet body top, and the benefit can be used in the direct mount on current cubical switchboard basis. Of course, in other embodiments, the device frame and the cabinet body may be integrally provided, so that the device frame needs to be processed together when the switch cabinet is processed.

In the above embodiment, the frame side wall has a double-layer structure and is composed of the outer side plate and the inner side plate, which is beneficial to improving the protection grade. Then, in the case of satisfying the protection grade, the frame side wall may also be of a single-layer structure. In a similar way, the pressure relief cover can be also designed to be of a single-layer structure under the condition of meeting the protection grade.

The invention also provides a specific embodiment of the switch cabinet pressure relief device, the specific structure of which is the same as that of the switch cabinet pressure relief device in each embodiment of the switch cabinet, and the detailed description is omitted here.

Claims

1. The switchgear pressure relief device includes a device frame with a pressure relief channel, and a pressure relief cover is provided on the top surface of the device frame. It is characterized in that an arc suppression structure is arranged in the pressure relief channel, and the arc suppression structure is provided. It includes baffles arranged in layers along the axis of the pressure relief channel, each layer of baffles is arranged at intervals, two adjacent layers of baffles are staggered along the direction perpendicular to the axis of the pressure relief channel and have overlapping parts along the axis of the pressure relief channel; the baffles There are heat dissipation holes on the plate; the heat dissipation holes have corners with acute angles; the pressure relief cover includes an outer layer cover plate and an inner layer cover plate, the inner layer cover plate is arranged on the inner side of the outer layer cover plate, the pressure relief cover includes an outer layer cover plate and an inner layer cover plate. The outer cover is provided with long holes for heat dissipation, the long holes are arranged on the top of the outer cover, the inner cover is provided with mesh holes; the inner side of the outer cover is provided with an inner cover The inner cover is provided with mesh holes that are different from the long holes on the outer cover, which can slow down the force of the arc sprayed out and ensure normal pressure relief.

2 . The pressure relief device for a switch cabinet according to claim 1 , wherein the heat dissipation hole is in the shape of a five-pointed star. 3 .

3. The switchgear pressure relief device according to any one of claims 1-2, wherein the baffle is provided with two layers, and the side of the upper baffle close to the pressure relief cover is provided with a downwardly bent The lower folded edge is provided with an upwardly bent upper folded edge on the side of the lower baffle plate away from the pressure relief cover, and the upper folded edge and the lower folded edge have overlapping parts along the axis of the pressure relief channel.

4 . The pressure relief device for a switch cabinet according to claim 3 , wherein the lower folded edge and the upper folded edge are both inclined folded edges. 5 .

5. The switch cabinet pressure relief device according to any one of claims 1-2, wherein the switch cabinet pressure relief device further comprises a support plate fixed in the device frame, and the support plate is provided with a baffle plate for the Through the perforation, the baffle is fixed in the perforation.

6. The switchgear pressure relief device according to any one of claims 1-2, wherein a side wall of the device frame is provided with a frame side wall, and the frame side wall comprises an outer side plate arranged on the outer layer and a On the inner side panel of the inner layer, the outer side panel is provided with long holes for heat dissipation, and the inner side panel is provided with mesh holes.

7. A switch cabinet, comprising a cabinet body and a switch cabinet pressure relief device arranged on the top of the cabinet body, wherein the switch cabinet pressure relief device is the switch cabinet pressure relief device according to any one of claims 1-6.